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Finding the Fourth Proportional to 810.21, 1,117.49 and 511.16

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Solution

The fourth proportional to 810.21, 1,117.49 and 511.16 is: 705.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.21 : 1,117.49 = 511.16 : x
  2. Step 2: Convert to fraction form
    810.21/1,117.49 = 511.16/x
  3. Step 3: Cross multiply
    810.21x = 1,117.49 × 511.16
  4. Step 4: Simplify right side
    810.21x = 571,208.05
  5. Step 5: Solve for x
    x = 571,208.05/810.21
  6. Step 6: Final answer
    x = 705.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.